[单选题]
For a diatomic quantum meche(3p.n zidim lc 3n4cd1nf1*oanical vibrator, the enea h0jv ;j+kpy0rgy difference between adjaceka;pj0y vj+0hnt quantum states
A. increases as v increases.
B. decreases as v increases.
C. is constant for all values of v.
D. varies randomly as v increases.